JPS6179850A - Stirling engine - Google Patents

Abstract

PURPOSE:To prevent oil from entering into a cylinder, by separating oil contained in working gas circulating between a reaction chamber for a power piston and a crank casing, in a Stirling engine, with the use of a filter, and by pumping out oil with the use of an oil feed pump, together with oil in a distance space. CONSTITUTION:In a Stirling engine, a heater pipe 2 and a cooler pipe 4 which are connected through a regenerator 3 are continuously heated and cooled, respectively, and therefore, a gas feed piston 5 and a power piston 7 are reciprocated with a phase difference therebetween which is regulated by a crank shaft 19. In this arrangement, a gas-oil separating filter 100 is disposed in a communication pipe 12 communicating the inside of the crank casing 9 with the power piston reaction chamber 10. Further, each of the oil reserving section 100b of the filter 100, the bottom section of the crank casing 9 and the bottom section of a distance space 11 and the suction port of an oil feed pump 23 are connected together through pipes 29, 24, 30 incorporating valves 27, 26, 28 respectively, so that oil in these section may be pumped out with suitable timing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a Stirling engine, and particularly to an oil spill prevention structure thereof.

(Prior Art) Fig. 3 is a diagram showing a schematic configuration of a typical displacer (air supply piston) type Stirling engine in which the gas/oil separation mechanism of the Stirling engine, which has already been developed by the inventor of the present invention, is applied. In the figure, 1 is a cylinder, 2 is a heater tube, 3 is a regenerator, 4 is a cooler tube, 5 is an air supply piston, 5a is a seal ring of the air supply piston 5,
6 is an air supply piston rod, 7 is a power piston, 7a is a seal ring for the power piston 7, 7b is a seal ring for sealing the air supply piston rod 6 that passes through the central axis of the power piston, 8 is a power piston rod, 9 is a closed pressurized crankcase, 10 is a reaction chamber of the power piston 7,
11 is a distance space, 12 is a gas/oil separation filter i that connects the power piston reaction chamber 10 and the crankcase 9.
oo (hereinafter referred to as oil separation filter). The oil separation filter 100 is
A filter element 100a and a filter housing 100 that separate lubricating oil from the gas flowing through this communication pipe 12
b (oil reservoir). 13 is an oil return hole that communicates between the distance space 11 and the crankcase 9; 14 is a rod seal for preventing gas leakage and oil from rising from the power piston rod 8; and 15 is an oil return hole that communicates with the distance space 11 and the crankcase 9; 16 is a bearing for freezing the reciprocating motion of the power piston rod 8 into linear motion; 17 is a connecting rod for the power piston; 18 is a connecting rod for the air supply piston; 19 is an oil seal for scraping off oil from the power piston rod 8; A crankshaft for reciprocating the air supply piston 5 and the power piston 7 while maintaining a predetermined phase difference and extracting output; 20 is a main bearing; 21 is for sealing the working fluid sealed in the crankcase 9; rotary shaft seal, 22 is lubricating oil, 2
3 is an oil supply pump for supplying oil to the rotary shaft seal 21, etc.; 24 is the bottom of the crankcase 9 and the oil supply pump 23;
a first pipe (first communication path) connecting the inlet of the 2
A pipe 5 connects the discharge port of the oil supply pump 23 and the rotary shaft seal portion, and is configured to supply the oil accumulated in the oil reservoir at the bottom of the crankcase to the rotary shaft seal 21. Note that the oil supplied to the rotary shaft seal 21 is returned into the crankcase 9.

The Stirling engine configured in this way continuously heats the heater tube 2 and the cooler tube 4.

Continuous cooling. By doing so, the air supply piston 5 and the power piston 7 are caused to reciprocate with a phase difference defined by the crankshaft 19, and the working fluid is caused to perform a thermodynamic cycle called a Stirling cycle, thereby generating power.

[Problem 3 to be solved by the invention The Stirling engine as described above has a power piston 7
Working fluid moves in and out of the reaction chamber 10 and the crankcase 9 as the engine reciprocates, and this working fluid contains droplets of lubricating oil in the crankcase. Therefore, in the Stirling engine having the above configuration, an oil separation filter 100 is provided in the middle of the communication pipe 12 that communicates the reaction chamber 10 and the crankcase 29, and the filter 100 separates the lubricating oil contained in the working fluid. This prevents lubricating oil from entering the cylinder and reducing engine performance.

However, when the engine is operated for a long period of time, lubricating oil accumulates in the oil separation filter 100, reducing its filter performance.As a result, oil accumulates in the reaction chamber 10, and this oil enters the cylinder. This may reduce engine performance.

Further, oil gradually enters the distance space 11 from the oil seal 15 of the power piston rod 8, and when the engine is operated for a long period of time, this oil fills the distance space 11 and enters the cylinder through the rod seal 14. There is. To prevent this phenomenon, oil return hole 1
3 was provided, but it did not function satisfactorily.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a Stirling engine that prevents oil from entering the cylinder and that does not cause deterioration in engine performance even when operated for a long time.

[Means for solving problems]

In the Stirling engine according to the present invention, a gas/oil separation filter is provided in the middle of the communication path that communicates the reaction chamber below the power piston with the crankcase, and the bottom part of the crankcase is
The oil reservoir part and the bottom part of the distance space of the gas/oil separation filter are each separated from the first. Second. It is connected to the suction port of the oil supply pump via a third communicating path, and each communicating path is provided with a valve, and valve control means is provided for switching these valves at appropriate times.

[Effect]

In this invention, the oil contained in the working gas flowing between the reaction chamber and the crankcase is separated by a gas/oil separation filter, and the oil that has accumulated in the filter and the oil that has entered the distance space is removed by an appropriate method. The oil pump is used to pump out the oil at the appropriate time to prevent the oil accumulated in the reaction chamber and distance space from entering the cylinder.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of a Stirling engine according to an embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 3 indicate the same parts. 26 is a first valve provided in the middle of the first bar f 24; 29 is a gas/oil separation filter 10;
A second pipe 30 connects the oil reservoir 100b of 0 and the suction port of the oil supply pump 23, and 30 is the distance space 1.
1 and the suction port of the oil supply pump 23.
The pipes 27 and 28 are the pipes 27 and 28, respectively. The second pipe provided in the middle of the third pipe 29.30. This is the third valve. Each of these valves 26, 27, and 28 is controlled to open and close by a valve control means (not shown), and is configured to switch the oil supply line to the oil supply pump 23.

Next, the effects will be explained.

If the engine is operated for a long period of time, the oil separation filter 1
Due to the deterioration of the performance of the filter 100, oil accumulates in the oil reservoir 1oob and the reaction chamber 10 of the filter 100. Further, due to leakage from the oil seal 15 of the working piston 10, oil rises into the distance space 11 and the reaction chamber 10, and the oil in the reaction chamber 10 travels through the communication pipe 12 and accumulates in the oil reservoir 100b of the oil separation filter 100.

Therefore, in this embodiment, during normal operation of the engine, the first valve 26 is opened and the second valve 26 is opened. The third valves 27 and 28 are closed, and in this state, the oil 22 accumulated at the bottom of the crankcase 9 is supplied to the rotary shaft seal 21 and the like by the oil supply pump 23. Then, at an appropriate time, the first one. Close third valve 26, 28, second valve 27
Open the oil reservoir 100b of the oil separation filter 100.
The oil accumulated in the tank is pumped out by the oil supply pump 23 and supplied to the rotary shaft seal 21, etc.Furthermore, the first and second valves 26 and 27 are closed and the third valve 28 is opened at an appropriate time. - The oil that has accumulated in the distance space 11 is pumped out by the oil supply pump 23 and supplied to the rotating shaft seal 21, etc. Due to this action, oil does not accumulate in the reaction chamber 1o, and therefore oil does not enter the cylinder. This can prevent deterioration of engine performance.

In the above embodiment, the recoil chamber 10, the distance space 11, the discance space 11 and the crankcase 9
have shown an example in which they are not connected to each other, but as shown in FIG.
1 one-way check valve 31 and distance space 11
A one-way check valve 32 is provided from the crankcase 9 to the crankcase 9,
The oil accumulated in the reaction chamber 10 and the distance space 11 may be returned to the crankcase 9 by the check valves 31 and 32 by utilizing the pressure fluctuations occurring in the reaction chamber IO.

〔Effect of the invention〕

As described above, according to the present invention, the oil reservoir and the distance space of the oil separation filter that communicate with the reaction chamber are connected to the oil supply pump through valves, and the oil reservoir and the distance space of the oil separation filter that communicate with the reaction chamber are connected to the oil supply pump at an appropriate time. The accumulated oil is pumped out using the oil pump, which prevents oil from entering the cylinder and allows the engine to run for long periods of time without degrading its performance. .

[Brief explanation of drawings]

Fig. 3 is a schematic diagram of a Stirling engine according to an embodiment of the present invention, Fig. 2 is a diagram showing another embodiment of the invention, and Fig. 3 is a schematic diagram of a Stirling engine developed by the inventor of the present invention. It is. DESCRIPTION OF SYMBOLS 1... Cylinder, 5... Air supply piston, 7... Power piston, 9... Crank case, 10... Power piston reaction chamber, 11... Discance space,
12...Communication pipe, 19...Crankshaft, 22...
l'l1fk oil, 23...oil pump, 24, 29.
30... 1st. 2nd ° 3rd pipe, 26, 27.2
8...1st. 2nd degree third valve, -00... gas/oil separation filter. Note that the same reference numerals in the figures indicate the same or equivalent parts. Agent: Ken Hayase, Patent Attorney - Figure 2

Claims (2)

[Claims] (1) A pressurized crank chamber housing a crank mechanism for reciprocating the air supply piston and the power piston with a predetermined phase difference; a reaction chamber provided below the power piston; In a Stirling engine equipped with a distance space separating the reaction chamber and the crank chamber, the space is provided in the middle of a communication passage that communicates the reaction chamber and the crank chamber, and is used to separate the lubricating oil contained in the gas flowing through the communication passage and to lubricate the gas. A gas/oil separation filter for storing oil, a first, a second, and a third connecting the bottom of the crankcase, the oil storage part of the gas/oil separation filter, the bottom of the distance space, and the suction port of the oil supply pump, respectively. 3 communication passages, first, second and third valves provided in the middle of the first, second and third communication passages, respectively;
A Stirling characterized by comprising a valve control means for controlling opening and closing of each of the third valves, and configured to discharge lubricating oil accumulated in the gas/oil separation filter and the distance space using the oil supply pump. engine. (2) The valve control means normally opens the first valve and closes the second and third valves, and when lubricating oil accumulates in the gas/oil separation filter or the distance space, the valve control means opens the first valve and closes the second and third valves.
2. The Stirling engine according to claim 1, wherein one valve is closed and a second or third valve is opened.